<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        {{msg}}<br>
        {{1+1}}<br />
        {{hello()}}
        <span v-html="msg"></span><br />
        <span v-text="msg"></span>
    </div>
    <script src="../node_modules/vue/dist/vue.js"></script>
    <script>
        let vm = new Vue({
            el: "#app",
            data: {
                msg: "<h1>Hello</h1>"
            },
            methods: {
                hello() {
                    return "hello world!"
                }
            }
        });
    </script>
</body>

</html>